Πορώδεις σχηματισμοί: Εδαφικά στρώματα που επιτρέπουν τη διείσδυση και την κυκλοφορία του νερού μέσα από την μάζα τους. Μπορούν δηλαδή να λειτουργούν ως ταμιευτήρες (το νερό αποθηκεύεται στους πόρους) και ως μέσο μεταφοράς του νερού (το νερό μεταφέρετε μέσα από τους πόρους). Η ποσότητα νερού που μπορεί να αποθηκευτεί σε ένα υδροφορέα εξαρτάται από το […]
6.2. Πορώδες – Υδραυλική αγωγιμότητα – Ειδική Απόδοση Read More »
How do we estimate the required irrigation water for an agricultural area?For each month of the year, we estimate the monthly evapotranspiration of the area and substruct the monthly rainfall. 1. Evaportranpiration What is the meaning of the term Evapotranspiration? Evapotranspiration (ET) of a crop is the total water lost due to evaporation from the
3.3. Estimating the demand for irrigation water Read More »
Υδροφορέας (aquifer): Υπόγειος γεωλογικός σχηματισμός που περιέχει νερό και είναι επαρκώς διαπερατός για να μπορεί να γίνει απόληψη και χρήση του νερού. Τέτοιοι σχηματισμοί είναι συνήθως εδαφικά στρώματα (άμμων, χαλικιών, κροκάλων) ή έντονα ρηγματωμένα πετρώματα ή καρστικά πετρώματα. Υπάρχουν δύο τύποι υπόγειων υδροφορέων: 1. Φρεάτιοι Υδροφορείς (unconfined aquifers): Έχουν ως κάτω όριο ένα αδιαπέρατο γεωλογικό
6.1. Υπόγειοι Υδροφορείς – Υπόγεια Νερά Read More »
Ιn water resources management we need a rough estimation of the drinking water demand. We need to know much water will be consumed in an area in order to plan how much water to collect and transfer to that area. We are not concerned about the daily variation of the demand. We are also not
3.2. Estimating the demand for drinking water Read More »
1. Introduction There are two types of water: Irrigation Water and Drinking Water. Irrigation water does not undergo any treatment. It is collected and transferred to rural areas for use in agriculture and livestock farming. Drinking water undergoes treatment and chlorination to make it safe for drinking. Drinking water supplies residential and industrial areas. Drinking
31) Which of the following statement is INCORRECT with regard to groundwater over-pumping: The lowering the water level at unconfined aquifers or the lowering of the pressure at confined aquifers, increases the pumping costs in a linear ratio. Groundwater over-pumping causes soil subsidence. Groundwater over-pumping can lead to damage to the perforated filter and the gravel
Water resource exam – Multiple choice questions 31-40 Read More »
21) The porosity (v) and the hydraulic conductivity (k) of four soil formations is shown below. Assume that all four formations have approximately the same dimensions, are located at approximately the same depth and are completely saturated. At which formation would you choose to drill in order to pump water. -n=31, k=0.1 m/day -n=18, k=800 m/day
Water resource exam – Multiple choice questions 21-30 Read More »
11) Which of the following statements is INCORRECT? Evapotranspiration (ET) is the sum of water losses from a field due to evaporation and transpiration. A Lysimeter, is a type of pot in which plants are grown. By measuring its weight, evaporation is calculated. Only real ET evapotranspiration (evaporation under conditions of limited water availability) can be
Water resource exam – Multiple choice questions 11-20 Read More »
(1) The annual runoff into a dam follows the normal distribution and the probability for an annual runoff between 50 and 150 MCM is 95%. What is the mean (μ) and standard deviation (SD) of the annual runoff? μ=100 ΜCM, SD=50MCM μ=100 ΜCM, SD=25MCM μ=120 ΜCM, SD=25MCM μ=100 ΜCM, SD=36 % (2) The water supply for
Water resource exam – Multiple choice questions 1-10 Read More »